A benchmark case of the Belt and Road Initiative: Ordos Hongjun Power Plant Joins hands with SCIYON to Enhance the resilience of Cambodia's power Grid

On the afternoon of April 23, a power line connecting Cambodia and Vietnam tripped suddenly, causing widespread power outages in the capital Phnom Penh and the southern part of Cambodia. During this crisis, the Ordos Hongjun Coal-fired Power Plant located in Sihanoukville Port utilized the power grid coordination system provided by SCIYON to accurately identify grid faults, quickly disconnect the power supply before the grid collapsed, successfully preserving the plant's power supply and avoiding a total power outage. This kept the spark for the restart of the Cambodian power grid and made it the "lone warrior" in the large-scale power outage in Phnom Penh.

This feat not only demonstrated the level and responsibility of China's power industry, but also set an example for energy projects of cooperation between China and Cambodia.

Cambodia Erdos Hongjun Power Co., Ltd. (C.I.I.D.G-Ordos Hongjun Power Co., Ltd.), jointly invested and constructed by China Inner Mongolia Erdos investment holding co., ltd. and Cambodia international investment and development group (C.I.I.D.G), is an important energy project of china-cambodia cooperation. The project features 3×135MW ultra-high voltage coal-fired units. Since its full operation in 2017, it has continuously supplied 17.3% of electricity to Phnom Penh, the capital of Cambodia, and the Sihanoukville port area, serving as a core energy hub supporting Cambodia 's economic development.

Guardian of Microgrid Safe Operation: SCIYON Machine-Grid Coordination System

In regions with weak grid stability such as Cambodia, the grid has characteristics such as "high volatility and prone to collapse". Once a fault occurs and causes a total power outage of the entire plant, it will bring huge losses to enterprises and the social economy.

Erdos Hongjun Power Plant has taken proactive measures and made early plans. It has adopted a tailor-made machine-grid coordination system by SCIYON. With the technical architecture of "active defense + intelligent response", it has built a "five-line defense" system for the safe operation of the microgrid, which helps to achieve a series of functions such as power grid fault monitoring, millisecond-level accident deregioning, and power generation units switching loads to drive plant power consumption. Fully control all the power sources and loads of the entire microgrid, issue relevant coordination control instructions in a timely manner, and safeguard the long-term stable operation of the microgrid.

▲ "Five Lines of defense" system ▲

Top 10 Core Functions

Real-time secondary frequency regulation (AGC) : Enable real-time calculation and monitoring of the rotating reserve capacity of the generator system, automatically adjust the output of the generator set, quickly adjust the active power of each generator set, and stabilize the grid frequency at 50Hz.

Real-time secondary voltage regulation (AVC) : Real-time automatic voltage and reactive power regulation of each generator to maintain grid voltage continuously.

Fast Frequency Modulation Module (FMS) : An optimization of the traditional DEH, which hands over control to the FMS after completing the rush and grid connection. FMS has three basic operating modes: single-machine secondary frequency modulation, manual secondary frequency modulation, and multi-machine secondary frequency modulation.

Special control System (SPS) : Real-time high-speed acquisition of power signals on the power generation side and the power consumption side, real-time analysis and location of grid fault types and faults. By quickly switching the power load or sending power regulation signals to the generator set according to the fault type, power generation and power consumption are balanced to ensure that the grid frequency and voltage quickly return to a stable state.

Low-frequency and low-voltage load shedding (UFLS) : The load is quickly removed based on frequency and voltage deviations to ensure that the grid frequency and voltage remain stable.

Automatic topology identification function: The machine-grid coordination system collects the status information of the main switches and circuit breakers of the primary system, collects PT and CT information, establishes a network topology model, automatically identifies the system topology, and automatically determines the operation mode.

Disconnection protection: The machine grid coordination system monitors the external grid and operation status in real time through disconnection protection. When there is a fault in the external grid, it actively disconnects the tie line switch and switches the internal grid to isolated operation to avoid fault crossing.

Load synchronization: After the external power grid is restored, the internal power grid is reconnected to the grid through the load synchronization function, and the grid is restored to grid-connected operation.

Heating management: For heating management, including back pressure control, thermoelectric decoupling function, heat load removal, etc.

Unit life optimization: Smooth out sudden load changes with a load balancing system; Establish load allowance signals with the load side to limit further changes on the load side when the proportion of sudden load surges exceeds the limit.

Significant application value

Enhancing grid resilience: Unlike other power plants that struggled to recover from this power outage, Erdos Hongjun Power Plant, through millisecond-level disconnection protection, enables the power plant to quickly enter isolated grid operation before the grid collapses, ensuring independent power supply capacity in extreme situations and avoiding complete power outages.

Accelerating grid recovery efficiency: Achieving rapid response in grid accidents, Erdos Hongjun Power Plant was the first to restore power supply within 20 minutes, becoming a core support for grid restart, significantly shortening the power recovery cycle and solving the problem of slow restart and difficult restoration of weak grids.

Strengthening the stability of weak power grids: Providing technical support for power plants under weak grid conditions to ensure their safe operation, enhancing the overall safety and stability of regional power grids from the source, and helping to address challenges such as complex transmission lines and insufficient power plant recovery capacity.

Reliable, practical and replicable: At the accident summary meeting, the outstanding performance of Erdos Hongjun Power Plant in this accident was highly praised by the National Electricity Company of Cambodia (EDC). It demonstrated the reliability and practicality of its technical solutions under complex conditions and became the core technology of replicable weak power grid safety solutions.

The successful practice of Erdos Hongjun Power Plant provides a replicable technical model for countries with weak power grid problems along the Belt and Road.

SCIYON will also continue to focus on microgrid security solutions centered on the machine-grid coordination system, dedicated to illuminating the future path of reliable power for global weak grid users and writing a vivid chapter of "Chinese technology empowering the world" in the construction of the "Belt and Road Initiative".